Why I think Nintendo Switch is set for another Wii U disaster.

[Soundwave]

Stop comparing it exclusively to the Wii U.

It's IS the 3DS successor too. That pretty much assures some sizable level of userbase. From a practical common sense POV, most of the Switch's potential audience is coming from the 3DS base (there isn't much of anything from the Wii U base to draw from in the first place). 

Whether we're talking 30-50 million, 60-70 million, or beyond that is anyone's guess at this point.

Some of you would call a dog a cat if Nintendo marketing told you so.

Once portables got to PS3/360 level of visual fidelity having some form of TV output was inevitable, had Sony made a PSP 3/Vita 2 it likely would also be able to play on the TV, because that level of graphics looks decent enough on a HDTV.